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	<title>API: imageloader  YAHOO.util.ImageLoader.group   (YUI Library)</title>

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        <h1><a href="http://developer.yahoo.com/yui/" title="Yahoo! UI Library">Yahoo! UI Library</a></h1>
        <h3>imageloader&nbsp; <span class="subtitle">2.9.0</span></h3>
        <a href="./index.html" title="Yahoo! UI Library">Yahoo! UI Library</a> 
            &gt; <a href="./module_imageloader.html" title="imageloader">imageloader</a>
                 &gt; YAHOO.util.ImageLoader.group 
                
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                    <h2>
                        

                        
                        
                            Class <b property="yui:name">YAHOO.util.ImageLoader.group</b>
                        <span class="extends">
                        </span>

                    </h2>
                    <!-- class tree goes here -->
                    
                
  

                    <div class="summary description" property="yui:description">
                        A group for images. A group can have one time limit and a series of triggers. Thus the images belonging to this group must share these constraints.
                    </div>

                        <div class="section constructor details" rel="yui:constructor" resource="#constructor">
                        <h3 id="constructor">Constructor</h3>
                        <div class="content">
                            <div class="detail">
                                <strong property="yui:name">YAHOO.util.ImageLoader.group</strong>
                                <code>
                                    (
  
                                        
                                                
                                                trigEl

                                                , 
                                                trigAct

                                                , 
                                                timeout
                                    )
                                </code>
                                <div class="description">
                                        <dl rel="yui:parameters">
                                            <dt>Parameters:</dt>
                                                <dd rel="yui:parameter">
                                                    <code><span property="yui:name">trigEl</span>
                                                    &lt;<span property="yui:type">String|HTMLElement</span>&gt;
                                                    </code>
                                                    <span property="yui:description">	The HTML element id or reference to assign the trigger event to. Can be null for no trigger</span>
                                                </dd>
                                                <dd rel="yui:parameter">
                                                    <code><span property="yui:name">trigAct</span>
                                                    &lt;<span property="yui:type">String</span>&gt;
                                                    </code>
                                                    <span property="yui:description"> The type of event to assign to trigEl. Can be null for no trigger</span>
                                                </dd>
                                                <dd rel="yui:parameter">
                                                    <code><span property="yui:name">timeout</span>
                                                    &lt;<span property="yui:type">Number</span>&gt;
                                                    </code>
                                                    <span property="yui:description">	Timeout (time limit) length, in seconds. Can be undefined, or <= 0, for no time limit</span>
                                                </dd>
                                        </dl>
                                    
                                    
                                </div>
                            </div>
                        </div>
                    </div>
                    
                    <div rel="yui:properties" resource="#properties">
                        <div class="section field details">
                            <h3 id="properties">Properties</h3>
                            <div class="content">
                                    <div class="private" rel="yui:property" resource="#property__classImageEls">
                                    <h4><a name="property__classImageEls" property="yui:name">_classImageEls</a>
                                        - <code>private <span property="yui:type">Array</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            HTML elements having the class name that is associated with this group
Elements are stored during the _foldCheck function and reused later during the fetch function. Gives a slight performance improvement when className and foldConditional are both used
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:property" resource="#property__customTriggers">
                                    <h4><a name="property__customTriggers" property="yui:name">_customTriggers</a>
                                        - <code>private <span property="yui:type">Array</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Collection of custom-event triggers for this group.
Keeps track of each trigger's event object and event-listener-callback "fetch" function
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:property" resource="#property__imgObjs">
                                    <h4><a name="property__imgObjs" property="yui:name">_imgObjs</a>
                                        - <code>private <span property="yui:type">Object</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Collection of images registered with this group
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:property" resource="#property__timeout">
                                    <h4><a name="property__timeout" property="yui:name">_timeout</a>
                                        - <code>private <span property="yui:type">Object</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Timeout object to keep a handle on the time limit
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:property" resource="#property__triggers">
                                    <h4><a name="property__triggers" property="yui:name">_triggers</a>
                                        - <code>private <span property="yui:type">Array</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Collection of triggers for this group.
Keeps track of each trigger's element, event, and event-listener-callback "fetch" function
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="" rel="yui:property" resource="#property_className">
                                    <h4><a name="property_className" property="yui:name">className</a>
                                        - <code><span property="yui:type">String</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Class name that will identify images belonging to the group. This class name will be removed from each element in order to fetch images.
This class should have, in its CSS style definition, "background:none !important;"
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="" rel="yui:property" resource="#property_foldConditional">
                                    <h4><a name="property_foldConditional" property="yui:name">foldConditional</a>
                                        - <code><span property="yui:type">Boolean</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Flag to check if images are above the fold. If foldConditional is true, the group will check each of its image locations at page load. If any part of the image is within the client viewport, the image is displayed immediately
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="" rel="yui:property" resource="#property_name">
                                    <h4><a name="property_name" property="yui:name">name</a>
                                        - <code><span property="yui:type">String</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Name for the group. Only used to identify the group in logging statements
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                                    <div class="" rel="yui:property" resource="#property_timeoutLen">
                                    <h4><a name="property_timeoutLen" property="yui:name">timeoutLen</a>
                                        - <code><span property="yui:type">Number</span></code>
                                    </h4>
                                    <div class="detail">
                                        <div class="description" property="yui:description">
                                            Timeout (time limit) length, in seconds
                                        </div>
                                    </div>
     
                                        


                                    <hr />
                                    </div>
                            </div>
                        </div>

                    </div>

                    <div rel="yui:methods" resource="#methods">
                        <div class="section method details">
                            <h3 id="methods">Methods</h3>
                            <div class="content">
                                    <div class="private" rel="yui:method" resource="#method__fetchByClass">
                                    <h4>
                                        <a name="method__fetchByClass">_fetchByClass</a></h4>
                                    <div class="detail" >
                                        <code>
                                         private 
                                        
                                        
                                        void
                                            <strong property="yui:name">_fetchByClass</strong>
                                           (
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Finds all elements in the Dom with the class name specified in the group. Removes the class from the element in order to let the style definitions trigger the image fetching
                                        </div>

                                        <div class="description">




             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:method" resource="#method__foldCheck">
                                    <h4>
                                        <a name="method__foldCheck">_foldCheck</a></h4>
                                    <div class="detail" >
                                        <code>
                                         private 
                                        
                                        
                                        void
                                            <strong property="yui:name">_foldCheck</strong>
                                           (
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Checks the position of each image in the group. If any part of the image is within the client viewport, shows the image immediately.
                                        </div>

                                        <div class="description">




             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:method" resource="#method__getFetchTimeout">
                                    <h4>
                                        <a name="method__getFetchTimeout">_getFetchTimeout</a></h4>
                                    <div class="detail" >
                                        <code>
                                         private 
                                        
                                        
                                        Function
                                            <strong property="yui:name">_getFetchTimeout</strong>
                                           (
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Returns the group's fetch method, with the proper closure, for use with setTimeout
                                        </div>

                                        <div class="description">


                                                <dl>
                                                    <dt>Returns:
                                                    <code property="yui:return">
                                                            Function
                                                    </code></dt>
                                                    <dd property="yui:returnInfo">group's fetch method</dd>
                                                </dl>


             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="private" rel="yui:method" resource="#method__onloadTasks">
                                    <h4>
                                        <a name="method__onloadTasks">_onloadTasks</a></h4>
                                    <div class="detail" >
                                        <code>
                                         private 
                                        
                                        
                                        void
                                            <strong property="yui:name">_onloadTasks</strong>
                                           (
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Setup to do in the window's onload
Initiates time limit for group; executes the fold check for the images
                                        </div>

                                        <div class="description">




             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_addCustomTrigger">
                                    <h4>
                                        <a name="method_addCustomTrigger">addCustomTrigger</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        void
                                            <strong property="yui:name">addCustomTrigger</strong>
                                           (
                                                
                                                        
                                                         event
                                                    
                                                
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Adds a custom event trigger to the group.
                                        </div>

                                        <div class="description">

                                                <dl rel="yui:parameters">
                                                    <dt>Parameters:</dt>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">event</span>
                                                        &lt;<span property="yui:type">Object</span>&gt;
                                                        </code>
                                                        <span property="yui:description"> A YAHOO.util.CustomEvent object</span>
                                                        </dd>
                                                </dl>



             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_addTrigger">
                                    <h4>
                                        <a name="method_addTrigger">addTrigger</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        void
                                            <strong property="yui:name">addTrigger</strong>
                                           (
                                                
                                                        
                                                         trigEl
                                                    
                                                
                                                        , 
                                                         trigAct
                                                    
                                                
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Adds a trigger to the group. Call this with the same style as YAHOO.util.Event.addListener
                                        </div>

                                        <div class="description">

                                                <dl rel="yui:parameters">
                                                    <dt>Parameters:</dt>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">trigEl</span>
                                                        &lt;<span property="yui:type">String|HTMLElement</span>&gt;
                                                        </code>
                                                        <span property="yui:description">  The HTML element id or reference to assign the trigger event to</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">trigAct</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description"> The type of event to assign to trigEl</span>
                                                        </dd>
                                                </dl>



             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_fetch">
                                    <h4>
                                        <a name="method_fetch">fetch</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        void
                                            <strong property="yui:name">fetch</strong>
                                           (
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Displays the images in the group
                                        </div>

                                        <div class="description">




             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_registerBgImage">
                                    <h4>
                                        <a name="method_registerBgImage">registerBgImage</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        Object
                                            <strong property="yui:name">registerBgImage</strong>
                                           (
                                                
                                                        
                                                         domId
                                                    
                                                
                                                        , 
                                                         url
                                                    
                                                
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Registers a background image with the group
                                        </div>

                                        <div class="description">

                                                <dl rel="yui:parameters">
                                                    <dt>Parameters:</dt>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">domId</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	HTML DOM id of the image element</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">url</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	URL for the image</span>
                                                        </dd>
                                                </dl>

                                                <dl>
                                                    <dt>Returns:
                                                    <code property="yui:return">
                                                            Object
                                                    </code></dt>
                                                    <dd property="yui:returnInfo">bgImgObj that was registered, for modifying any attributes in the object</dd>
                                                </dl>


             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_registerPngBgImage">
                                    <h4>
                                        <a name="method_registerPngBgImage">registerPngBgImage</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        Object
                                            <strong property="yui:name">registerPngBgImage</strong>
                                           (
                                                
                                                        
                                                         domId
                                                    
                                                
                                                        , 
                                                         url
                                                    
                                                
                                                        , 
                                                         ailProps
                                                    
                                                
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Registers an alpha-channel-type png background image with the group
                                        </div>

                                        <div class="description">

                                                <dl rel="yui:parameters">
                                                    <dt>Parameters:</dt>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">domId</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	HTML DOM id of the image element</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">url</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	URL for the image</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">ailProps</span>
                                                        &lt;<span property="yui:type">Object</span>&gt;
                                                        </code>
                                                        <span property="yui:description"> The AlphaImageLoader properties to be set for the image
Valid properties are 'sizingMethod' and 'enabled'</span>
                                                        </dd>
                                                </dl>

                                                <dl>
                                                    <dt>Returns:
                                                    <code property="yui:return">
                                                            Object
                                                    </code></dt>
                                                    <dd property="yui:returnInfo">pngBgImgObj that was registered, for modifying any attributes in the object</dd>
                                                </dl>


             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                                    <div class="" rel="yui:method" resource="#method_registerSrcImage">
                                    <h4>
                                        <a name="method_registerSrcImage">registerSrcImage</a></h4>
                                    <div class="detail" >
                                        <code>
                                        
                                        
                                        
                                        Object
                                            <strong property="yui:name">registerSrcImage</strong>
                                           (
                                                
                                                        
                                                         domId
                                                    
                                                
                                                        , 
                                                         url
                                                    
                                                
                                                        , 
                                                         width
                                                    
                                                
                                                        , 
                                                         height
                                                    
                                                
                                            )
                                        </code>
                                        
                                        <div class="description" property="yui:description">
                                            Registers a src image with the group
                                        </div>

                                        <div class="description">

                                                <dl rel="yui:parameters">
                                                    <dt>Parameters:</dt>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">domId</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	HTML DOM id of the image element</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">url</span>
                                                        &lt;<span property="yui:type">String</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	URL for the image</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">width</span>
                                                        &lt;<span property="yui:type">Int</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	pixel width of the image - defaults to image's natural size</span>
                                                        </dd>
                                                        <dd rel="yui:parameter">
                                                        <code><span property="yui:name">height</span>
                                                        &lt;<span property="yui:type">Int</span>&gt;
                                                        </code>
                                                        <span property="yui:description">	pixel height of the image - defaults to image's natural size</span>
                                                        </dd>
                                                </dl>

                                                <dl>
                                                    <dt>Returns:
                                                    <code property="yui:return">
                                                            Object
                                                    </code></dt>
                                                    <dd property="yui:returnInfo">srcImgObj that was registered, for modifying any attributes in the object</dd>
                                                </dl>


             

                                        </div>

                                    </div>
                                    <hr />
                                    </div>
                            </div>
                        </div>

                    </div>

                    <div rel="yui:events" resource="#events">


                    </div>

                    <div rel="yui:attributes" resource="#configattributes">

                    </div>

			</div>
		</div>
		<div class="yui-b">
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                                <li class=""><a href="module_layout.html" title="layout">layout</a></li>
                                <li class=""><a href="module_logger.html" title="logger">logger</a></li>
                                <li class=""><a href="module_menu.html" title="menu">menu</a></li>
                                <li class=""><a href="module_paginator.html" title="paginator">paginator</a></li>
                                <li class=""><a href="module_profiler.html" title="profiler">profiler</a></li>
                                <li class=""><a href="module_profilerviewer.html" title="profilerviewer">profilerviewer</a></li>
                                <li class=""><a href="module_progressbar.html" title="progressbar">progressbar</a></li>
                                <li class=""><a href="module_resize.html" title="resize">resize</a></li>
                                <li class=""><a href="module_selector.html" title="selector">selector</a></li>
                                <li class=""><a href="module_slider.html" title="slider">slider</a></li>
                                <li class=""><a href="module_storage.html" title="Storage">Storage</a></li>
                                <li class=""><a href="module_stylesheet.html" title="stylesheet">stylesheet</a></li>
                                <li class=""><a href="module_swf.html" title="swf">swf</a></li>
                                <li class=""><a href="module_swfdetect.html" title="swfdetect">swfdetect</a></li>
                                <li class=""><a href="module_swfstore.html" title="swfstore">swfstore</a></li>
                                <li class=""><a href="module_tabview.html" title="tabview">tabview</a></li>
                                <li class=""><a href="module_treeview.html" title="treeview">treeview</a></li>
                                <li class=""><a href="module_uploader.html" title="uploader">uploader</a></li>
                                <li class=""><a href="module_yahoo.html" title="yahoo">yahoo</a></li>
                                <li class=""><a href="module_yuiloader.html" title="yuiloader">yuiloader</a></li>
                                <li class=""><a href="module_yuitest.html" title="yuitest">yuitest</a></li>
                        </ul>
                    </div>

                    <div id="classList" class="module">
                        <h4>Classes</h4>
                        <ul class="content">
                                <li class=""><a href="YAHOO.util.ImageLoader.bgImgObj.html" title="YAHOO.util.ImageLoader.bgImgObj">YAHOO.util.ImageLoader.bgImgObj</a></li>
                                <li class="selected"><a href="YAHOO.util.ImageLoader.group.html" title="YAHOO.util.ImageLoader.group">YAHOO.util.ImageLoader.group</a></li>
                                <li class=""><a href="YAHOO.util.ImageLoader.imgObj.html" title="YAHOO.util.ImageLoader.imgObj">YAHOO.util.ImageLoader.imgObj</a></li>
                                <li class=""><a href="YAHOO.util.ImageLoader.pngBgImgObj.html" title="YAHOO.util.ImageLoader.pngBgImgObj">YAHOO.util.ImageLoader.pngBgImgObj</a></li>
                                <li class=""><a href="YAHOO.util.ImageLoader.srcImgObj.html" title="YAHOO.util.ImageLoader.srcImgObj">YAHOO.util.ImageLoader.srcImgObj</a></li>
                        </ul>
                    </div>

                    <div id="fileList" class="module">
                        <h4>Files</h4>
                        <ul class="content">        
                                <li class=""><a href="ImageLoader.js.html" title="ImageLoader.js">ImageLoader.js</a></li>
                        </ul>
                    </div>

                    <div id="propertyList" class="module">
                        <h4>Properties</h4>
                        <ul class="content">        
                                <li class="private"><a href="#property__classImageEls" title="_classImageEls">_classImageEls</a></li>
                                <li class="private"><a href="#property__customTriggers" title="_customTriggers">_customTriggers</a></li>
                                <li class="private"><a href="#property__imgObjs" title="_imgObjs">_imgObjs</a></li>
                                <li class="private"><a href="#property__timeout" title="_timeout">_timeout</a></li>
                                <li class="private"><a href="#property__triggers" title="_triggers">_triggers</a></li>
                                <li class=""><a href="#property_className" title="className">className</a></li>
                                <li class=""><a href="#property_foldConditional" title="foldConditional">foldConditional</a></li>
                                <li class=""><a href="#property_name" title="name">name</a></li>
                                <li class=""><a href="#property_timeoutLen" title="timeoutLen">timeoutLen</a></li>
                        </ul>
                    </div>

                    <div id="methodsList" class="module">
                        <h4>Methods</h4>
                        <ul class="content">        
                                <li class="private"><a href="#method__fetchByClass" title="_fetchByClass">_fetchByClass</a></li>
                                <li class="private"><a href="#method__foldCheck" title="_foldCheck">_foldCheck</a></li>
                                <li class="private"><a href="#method__getFetchTimeout" title="_getFetchTimeout">_getFetchTimeout</a></li>
                                <li class="private"><a href="#method__onloadTasks" title="_onloadTasks">_onloadTasks</a></li>
                                <li class=""><a href="#method_addCustomTrigger" title="addCustomTrigger">addCustomTrigger</a></li>
                                <li class=""><a href="#method_addTrigger" title="addTrigger">addTrigger</a></li>
                                <li class=""><a href="#method_fetch" title="fetch">fetch</a></li>
                                <li class=""><a href="#method_registerBgImage" title="registerBgImage">registerBgImage</a></li>
                                <li class=""><a href="#method_registerPngBgImage" title="registerPngBgImage">registerPngBgImage</a></li>
                                <li class=""><a href="#method_registerSrcImage" title="registerSrcImage">registerSrcImage</a></li>
                        </ul>
                    </div>



            </div>
		</div>
	</div>
	<div id="ft">
        <hr />
        Copyright &copy; 2011 Yahoo! Inc. All rights reserved.
	</div>
</div>
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